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@eddie
In other words,
Octalink is more stiff than Square taper, but less durable and practical.
It is not taper-fit so the crank doesn't sit snugly on the spindle and has been shown to undo the bolt and damage your cranks. Also because Octalink has a thicker spindle, the bearings are smaller, making them wear out quicker.
GO FOR SQUARE TAPER.